bq24020, bq24022, bq24023
bq24024, bq24025, bq24026
bq24027
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SLUS549D–DECEMBER 2002–REVISED MARCH 2006
FUNCTIONAL DESCRIPTION (continued)
POR
SLEEP MODE
Vcc > VI(OUT)
checked at all times
No
Indicate SLEEP
MODE
Yes
Regulate
IO(PRECHG)
Reset and Start
(PRECHG) timer
V
I(OUT<) V
Yes
(LOWV)
t
Indicate Charge-
In-Progress
No
Reset all timers,
Start t(CHG) timer
Regulate Current
or Voltage
Indicate Charge-
In-Progress
No
VI(OUT<) V
(LOWV)
Yes
Yes
t(PRECHG)
No
Expired?
t(CHG)Expired?
Yes
No
Yes
Fault Condition
Indicate Fault
Yes
VI(OUT) <V(LOWV)
No
I(TERM)
detection?
VI(OUT)> V
?
(RCH)
Yes
No
No
No
t(TAPER)
Expired?
(1)
Enable I(FAULT)
current
I(TAPER)
detection?
Yes
No
No
Yes
VI(OUT)> V
?
(RCH)
Yes
Turn off charge
Indicate DONE
Yes
Yes
Disable I(FAULT)
current
No
V
I(OUT) < V
(RCH)
?
(1)
t
does not apply to bq24026/7
(TAPER)
11
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